是什么并不意味着这两个运营商的QUOT; | =＆QUOT;和＆QUOT; |＆QUOT; [英] what does mean these two operator "|=" and "|"

问题描述

我发现在应用程序源$ C ​​$ C这一行，但我不能弄清楚按位或包容性的运算符 | 的意思。这两个标志之间的

<$p$p><$c$c>notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);

我也没明白这个运营商的意义 |在以下行=

  notification.flags | = Notification.FLAG_AUTO_CANCEL;
 

有人可以帮助我PLZ。

解决方案

我开始我的答案，而没有其他人回答了，所以我决定无论如何要完成它......

管道和符号 |和与放大器; 分别执行或和和操作

您会看惯 || 和＆放大器;＆安培; ，它执行布尔逻辑或和和，并使用一个单一的的|或放大器; 是位运算

如果你看看旗文档上，为clear_top标志为0x04000000，而single_top是0x20000000。

您正在执行的操作因此：
0x04000000 OR 0x20000000 = 0x24000000处

其中设置所需的位中的意图同时使用所需的标志

的 A | = B 操作符是 A = A重载相当于| b ，类似于 + = ，的用法 - 或 ++ ，你应该用在其他地方看到

I have found this line in an application source code but i cant figure out the meaning of the bitwise or inclusive operator "|" between the two flags.

notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);

I did not also understand the meaning of this operator |= in the following line:

notification.flags |= Notification.FLAG_AUTO_CANCEL;

Someone could help me plz.

解决方案

I'd started my answer while no-one else had answered, so I decided to finish it anyway...

The pipe and ampersand | and & perform the OR and AND operations respectively.

You'll be used to seeing || and &&, which perform the boolean logic OR and AND, and the use of a single | or & is a bitwise operation.

If you look on the flag documentation, the flag for clear_top is 0x04000000, and single_top is 0x20000000.

The operation which you are performing is therefore: 0x04000000 OR 0x20000000 = 0x24000000

Which sets the required bits in the intent to use both of the desired flags.

The a |= b operator is the overloaded equivalent of a = a | b, similar to the usage of +=, -- or ++, which you should be used to seeing elsewhere

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